// 弹性布局
.flex {
  display: flex;
}

.flex-size {
  flex: 1
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.flex-column {
  flex-direction: column;
}

.inline-flex {
  display: inline-flex;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.justify-start {
  justify-content: start;
}

.justify-end {
  justify-content: flex-end;
}

.items-center {
  align-items: center;
}

.items-end {
  align-items: flex-end;
}



